package com.fxanadu.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.fxanadu.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*L
 * 检查用户是否已经登录
 * */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的uri
        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        //如果不需要处理，放行
        if (check){
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //判断登录状态，如果已经登录，直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户Id为：{}", request.getSession().getAttribute("employee"));

//            Long empId = (Long) request.getSession().getAttribute("employee");
//            BaseContext.setCurrentId(empId);

            log.info("用户未登录");
            filterChain.doFilter(request, response);
            return;
        }

        //如果没登录，返回结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    //检测本次请求是否需要放行
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
